In the world of Ar Ciel, the Reyvateil region is being threatened by an epidemic that's been killing the citizens. A knight from the Grand Bell, Croix, is sent there to deal with the epidemic. The people of Metafalss, lead by the Grand Bell, rebel against the Goddess who controls the world, in order to achieve their dream and create a utopia by singing a Song in the Hymnos language, called Metafalica - as the legend says. (mobygames)